--- /dev/null
+/*
+ * Intel Langwell USB Device Controller driver
+ * Copyright (C) 2008-2009, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+/* #undef DEBUG */
+/* #undef VERBOSE */
+
+#if defined(CONFIG_USB_LANGWELL_OTG)
+#define OTG_TRANSCEIVER
+#endif
+
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
+#include <linux/pm.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+#include "langwell_udc.h"
+
+
+#define DRIVER_DESC "Intel Langwell USB Device Controller driver"
+#define DRIVER_VERSION "16 May 2009"
+
+static const char driver_name[] = "langwell_udc";
+static const char driver_desc[] = DRIVER_DESC;
+
+
+/* controller device global variable */
+static struct langwell_udc *the_controller;
+
+/* for endpoint 0 operations */
+static const struct usb_endpoint_descriptor
+langwell_ep0_desc = {
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ .wMaxPacketSize = EP0_MAX_PKT_SIZE,
+};
+
+
+/*-------------------------------------------------------------------------*/
+/* debugging */
+
+#ifdef DEBUG
+#define DBG(dev, fmt, args...) \
+ pr_debug("%s %s: " fmt , driver_name, \
+ pci_name(dev->pdev), ## args)
+#else
+#define DBG(dev, fmt, args...) \
+ do { } while (0)
+#endif /* DEBUG */
+
+
+#ifdef VERBOSE
+#define VDBG DBG
+#else
+#define VDBG(dev, fmt, args...) \
+ do { } while (0)
+#endif /* VERBOSE */
+
+
+#define ERROR(dev, fmt, args...) \
+ pr_err("%s %s: " fmt , driver_name, \
+ pci_name(dev->pdev), ## args)
+
+#define WARNING(dev, fmt, args...) \
+ pr_warning("%s %s: " fmt , driver_name, \
+ pci_name(dev->pdev), ## args)
+
+#define INFO(dev, fmt, args...) \
+ pr_info("%s %s: " fmt , driver_name, \
+ pci_name(dev->pdev), ## args)
+
+
+#ifdef VERBOSE
+static inline void print_all_registers(struct langwell_udc *dev)
+{
+ int i;
+
+ /* Capability Registers */
+ printk(KERN_DEBUG "Capability Registers (offset: "
+ "0x%04x, length: 0x%08x)\n",
+ CAP_REG_OFFSET,
+ (u32)sizeof(struct langwell_cap_regs));
+ printk(KERN_DEBUG "caplength=0x%02x\n",
+ readb(&dev->cap_regs->caplength));
+ printk(KERN_DEBUG "hciversion=0x%04x\n",
+ readw(&dev->cap_regs->hciversion));
+ printk(KERN_DEBUG "hcsparams=0x%08x\n",
+ readl(&dev->cap_regs->hcsparams));
+ printk(KERN_DEBUG "hccparams=0x%08x\n",
+ readl(&dev->cap_regs->hccparams));
+ printk(KERN_DEBUG "dciversion=0x%04x\n",
+ readw(&dev->cap_regs->dciversion));
+ printk(KERN_DEBUG "dccparams=0x%08x\n",
+ readl(&dev->cap_regs->dccparams));
+
+ /* Operational Registers */
+ printk(KERN_DEBUG "Operational Registers (offset: "
+ "0x%04x, length: 0x%08x)\n",
+ OP_REG_OFFSET,
+ (u32)sizeof(struct langwell_op_regs));
+ printk(KERN_DEBUG "extsts=0x%08x\n",
+ readl(&dev->op_regs->extsts));
+ printk(KERN_DEBUG "extintr=0x%08x\n",
+ readl(&dev->op_regs->extintr));
+ printk(KERN_DEBUG "usbcmd=0x%08x\n",
+ readl(&dev->op_regs->usbcmd));
+ printk(KERN_DEBUG "usbsts=0x%08x\n",
+ readl(&dev->op_regs->usbsts));
+ printk(KERN_DEBUG "usbintr=0x%08x\n",
+ readl(&dev->op_regs->usbintr));
+ printk(KERN_DEBUG "frindex=0x%08x\n",
+ readl(&dev->op_regs->frindex));
+ printk(KERN_DEBUG "ctrldssegment=0x%08x\n",
+ readl(&dev->op_regs->ctrldssegment));
+ printk(KERN_DEBUG "deviceaddr=0x%08x\n",
+ readl(&dev->op_regs->deviceaddr));
+ printk(KERN_DEBUG "endpointlistaddr=0x%08x\n",
+ readl(&dev->op_regs->endpointlistaddr));
+ printk(KERN_DEBUG "ttctrl=0x%08x\n",
+ readl(&dev->op_regs->ttctrl));
+ printk(KERN_DEBUG "burstsize=0x%08x\n",
+ readl(&dev->op_regs->burstsize));
+ printk(KERN_DEBUG "txfilltuning=0x%08x\n",
+ readl(&dev->op_regs->txfilltuning));
+ printk(KERN_DEBUG "txttfilltuning=0x%08x\n",
+ readl(&dev->op_regs->txttfilltuning));
+ printk(KERN_DEBUG "ic_usb=0x%08x\n",
+ readl(&dev->op_regs->ic_usb));
+ printk(KERN_DEBUG "ulpi_viewport=0x%08x\n",
+ readl(&dev->op_regs->ulpi_viewport));
+ printk(KERN_DEBUG "configflag=0x%08x\n",
+ readl(&dev->op_regs->configflag));
+ printk(KERN_DEBUG "portsc1=0x%08x\n",
+ readl(&dev->op_regs->portsc1));
+ printk(KERN_DEBUG "devlc=0x%08x\n",
+ readl(&dev->op_regs->devlc));
+ printk(KERN_DEBUG "otgsc=0x%08x\n",
+ readl(&dev->op_regs->otgsc));
+ printk(KERN_DEBUG "usbmode=0x%08x\n",
+ readl(&dev->op_regs->usbmode));
+ printk(KERN_DEBUG "endptnak=0x%08x\n",
+ readl(&dev->op_regs->endptnak));
+ printk(KERN_DEBUG "endptnaken=0x%08x\n",
+ readl(&dev->op_regs->endptnaken));
+ printk(KERN_DEBUG "endptsetupstat=0x%08x\n",
+ readl(&dev->op_regs->endptsetupstat));
+ printk(KERN_DEBUG "endptprime=0x%08x\n",
+ readl(&dev->op_regs->endptprime));
+ printk(KERN_DEBUG "endptflush=0x%08x\n",
+ readl(&dev->op_regs->endptflush));
+ printk(KERN_DEBUG "endptstat=0x%08x\n",
+ readl(&dev->op_regs->endptstat));
+ printk(KERN_DEBUG "endptcomplete=0x%08x\n",
+ readl(&dev->op_regs->endptcomplete));
+
+ for (i = 0; i < dev->ep_max / 2; i++) {
+ printk(KERN_DEBUG "endptctrl[%d]=0x%08x\n",
+ i, readl(&dev->op_regs->endptctrl[i]));
+ }
+}
+#endif /* VERBOSE */
+
+
+/*-------------------------------------------------------------------------*/
+
+#define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
+
+#define is_in(ep) (((ep)->ep_num == 0) ? ((ep)->dev->ep0_dir == \
+ USB_DIR_IN) : ((ep)->desc->bEndpointAddress \
+ & USB_DIR_IN) == USB_DIR_IN)
+
+
+#ifdef DEBUG
+static char *type_string(u8 bmAttributes)
+{
+ switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
+ case USB_ENDPOINT_XFER_BULK:
+ return "bulk";
+ case USB_ENDPOINT_XFER_ISOC:
+ return "iso";
+ case USB_ENDPOINT_XFER_INT:
+ return "int";
+ };
+
+ return "control";
+}
+#endif
+
+
+/* configure endpoint control registers */
+static void ep_reset(struct langwell_ep *ep, unsigned char ep_num,
+ unsigned char is_in, unsigned char ep_type)
+{
+ struct langwell_udc *dev;
+ u32 endptctrl;
+
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+ if (is_in) { /* TX */
+ if (ep_num)
+ endptctrl |= EPCTRL_TXR;
+ endptctrl |= EPCTRL_TXE;
+ endptctrl |= ep_type << EPCTRL_TXT_SHIFT;
+ } else { /* RX */
+ if (ep_num)
+ endptctrl |= EPCTRL_RXR;
+ endptctrl |= EPCTRL_RXE;
+ endptctrl |= ep_type << EPCTRL_RXT_SHIFT;
+ }
+
+ writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* reset ep0 dQH and endptctrl */
+static void ep0_reset(struct langwell_udc *dev)
+{
+ struct langwell_ep *ep;
+ int i;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* ep0 in and out */
+ for (i = 0; i < 2; i++) {
+ ep = &dev->ep[i];
+ ep->dev = dev;
+
+ /* ep0 dQH */
+ ep->dqh = &dev->ep_dqh[i];
+
+ /* configure ep0 endpoint capabilities in dQH */
+ ep->dqh->dqh_ios = 1;
+ ep->dqh->dqh_mpl = EP0_MAX_PKT_SIZE;
+
+ /* FIXME: enable ep0-in HW zero length termination select */
+ if (is_in(ep))
+ ep->dqh->dqh_zlt = 0;
+ ep->dqh->dqh_mult = 0;
+
+ /* configure ep0 control registers */
+ ep_reset(&dev->ep[0], 0, i, USB_ENDPOINT_XFER_CONTROL);
+ }
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoints operations */
+
+/* configure endpoint, making it usable */
+static int langwell_ep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct langwell_udc *dev;
+ struct langwell_ep *ep;
+ u16 max = 0;
+ unsigned long flags;
+ int retval = 0;
+ unsigned char zlt, ios = 0, mult = 0;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !desc || ep->desc
+ || desc->bDescriptorType != USB_DT_ENDPOINT)
+ return -EINVAL;
+
+ if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+ return -ESHUTDOWN;
+
+ max = le16_to_cpu(desc->wMaxPacketSize);
+
+ /*
+ * disable HW zero length termination select
+ * driver handles zero length packet through req->req.zero
+ */
+ zlt = 1;
+
+ /*
+ * sanity check type, direction, address, and then
+ * initialize the endpoint capabilities fields in dQH
+ */
+ switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ ios = 1;
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ if ((dev->gadget.speed == USB_SPEED_HIGH
+ && max != 512)
+ || (dev->gadget.speed == USB_SPEED_FULL
+ && max > 64)) {
+ goto done;
+ }
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
+ goto done;
+
+ switch (dev->gadget.speed) {
+ case USB_SPEED_HIGH:
+ if (max <= 1024)
+ break;
+ case USB_SPEED_FULL:
+ if (max <= 64)
+ break;
+ default:
+ if (max <= 8)
+ break;
+ goto done;
+ }
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ if (strstr(ep->ep.name, "-bulk")
+ || strstr(ep->ep.name, "-int"))
+ goto done;
+
+ switch (dev->gadget.speed) {
+ case USB_SPEED_HIGH:
+ if (max <= 1024)
+ break;
+ case USB_SPEED_FULL:
+ if (max <= 1023)
+ break;
+ default:
+ goto done;
+ }
+ /*
+ * FIXME:
+ * calculate transactions needed for high bandwidth iso
+ */
+ mult = (unsigned char)(1 + ((max >> 11) & 0x03));
+ max = max & 0x8ff; /* bit 0~10 */
+ /* 3 transactions at most */
+ if (mult > 3)
+ goto done;
+ break;
+ default:
+ goto done;
+ }
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* configure endpoint capabilities in dQH */
+ ep->dqh->dqh_ios = ios;
+ ep->dqh->dqh_mpl = cpu_to_le16(max);
+ ep->dqh->dqh_zlt = zlt;
+ ep->dqh->dqh_mult = mult;
+
+ ep->ep.maxpacket = max;
+ ep->desc = desc;
+ ep->stopped = 0;
+ ep->ep_num = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+
+ /* ep_type */
+ ep->ep_type = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+
+ /* configure endpoint control registers */
+ ep_reset(ep, ep->ep_num, is_in(ep), ep->ep_type);
+
+ DBG(dev, "enabled %s (ep%d%s-%s), max %04x\n",
+ _ep->name,
+ ep->ep_num,
+ DIR_STRING(desc->bEndpointAddress),
+ type_string(desc->bmAttributes),
+ max);
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+done:
+ VDBG(dev, "<--- %s()\n", __func__);
+ return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* retire a request */
+static void done(struct langwell_ep *ep, struct langwell_request *req,
+ int status)
+{
+ struct langwell_udc *dev = ep->dev;
+ unsigned stopped = ep->stopped;
+ struct langwell_dtd *curr_dtd, *next_dtd;
+ int i;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* remove the req from ep->queue */
+ list_del_init(&req->queue);
+
+ if (req->req.status == -EINPROGRESS)
+ req->req.status = status;
+ else
+ status = req->req.status;
+
+ /* free dTD for the request */
+ next_dtd = req->head;
+ for (i = 0; i < req->dtd_count; i++) {
+ curr_dtd = next_dtd;
+ if (i != req->dtd_count - 1)
+ next_dtd = curr_dtd->next_dtd_virt;
+ dma_pool_free(dev->dtd_pool, curr_dtd, curr_dtd->dtd_dma);
+ }
+
+ if (req->mapped) {
+ dma_unmap_single(&dev->pdev->dev, req->req.dma, req->req.length,
+ is_in(ep) ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
+ req->req.dma = DMA_ADDR_INVALID;
+ req->mapped = 0;
+ } else
+ dma_sync_single_for_cpu(&dev->pdev->dev, req->req.dma,
+ req->req.length,
+ is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+
+ if (status != -ESHUTDOWN)
+ DBG(dev, "complete %s, req %p, stat %d, len %u/%u\n",
+ ep->ep.name, &req->req, status,
+ req->req.actual, req->req.length);
+
+ /* don't modify queue heads during completion callback */
+ ep->stopped = 1;
+
+ spin_unlock(&dev->lock);
+ /* complete routine from gadget driver */
+ if (req->req.complete)
+ req->req.complete(&ep->ep, &req->req);
+
+ spin_lock(&dev->lock);
+ ep->stopped = stopped;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+static void langwell_ep_fifo_flush(struct usb_ep *_ep);
+
+/* delete all endpoint requests, called with spinlock held */
+static void nuke(struct langwell_ep *ep, int status)
+{
+ /* called with spinlock held */
+ ep->stopped = 1;
+
+ /* endpoint fifo flush */
+ if (&ep->ep && ep->desc)
+ langwell_ep_fifo_flush(&ep->ep);
+
+ while (!list_empty(&ep->queue)) {
+ struct langwell_request *req = NULL;
+ req = list_entry(ep->queue.next, struct langwell_request,
+ queue);
+ done(ep, req, status);
+ }
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint is no longer usable */
+static int langwell_ep_disable(struct usb_ep *_ep)
+{
+ struct langwell_ep *ep;
+ unsigned long flags;
+ struct langwell_udc *dev;
+ int ep_num;
+ u32 endptctrl;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !ep->desc)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* disable endpoint control register */
+ ep_num = ep->ep_num;
+ endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+ if (is_in(ep))
+ endptctrl &= ~EPCTRL_TXE;
+ else
+ endptctrl &= ~EPCTRL_RXE;
+ writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+ /* nuke all pending requests (does flush) */
+ nuke(ep, -ESHUTDOWN);
+
+ ep->desc = NULL;
+ ep->stopped = 1;
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ DBG(dev, "disabled %s\n", _ep->name);
+ VDBG(dev, "<--- %s()\n", __func__);
+
+ return 0;
+}
+
+
+/* allocate a request object to use with this endpoint */
+static struct usb_request *langwell_alloc_request(struct usb_ep *_ep,
+ gfp_t gfp_flags)
+{
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+ struct langwell_request *req = NULL;
+
+ if (!_ep)
+ return NULL;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ req = kzalloc(sizeof(*req), gfp_flags);
+ if (!req)
+ return NULL;
+
+ req->req.dma = DMA_ADDR_INVALID;
+ INIT_LIST_HEAD(&req->queue);
+
+ VDBG(dev, "alloc request for %s\n", _ep->name);
+ VDBG(dev, "<--- %s()\n", __func__);
+ return &req->req;
+}
+
+
+/* free a request object */
+static void langwell_free_request(struct usb_ep *_ep,
+ struct usb_request *_req)
+{
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+ struct langwell_request *req = NULL;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !_req)
+ return;
+
+ req = container_of(_req, struct langwell_request, req);
+ WARN_ON(!list_empty(&req->queue));
+
+ if (_req)
+ kfree(req);
+
+ VDBG(dev, "free request for %s\n", _ep->name);
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* queue dTD and PRIME endpoint */
+static int queue_dtd(struct langwell_ep *ep, struct langwell_request *req)
+{
+ u32 bit_mask, usbcmd, endptstat, dtd_dma;
+ u8 dtd_status;
+ int i;
+ struct langwell_dqh *dqh;
+ struct langwell_udc *dev;
+
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ i = ep->ep_num * 2 + is_in(ep);
+ dqh = &dev->ep_dqh[i];
+
+ if (ep->ep_num)
+ VDBG(dev, "%s\n", ep->name);
+ else
+ /* ep0 */
+ VDBG(dev, "%s-%s\n", ep->name, is_in(ep) ? "in" : "out");
+
+ VDBG(dev, "ep_dqh[%d] addr: 0x%08x\n", i, (u32)&(dev->ep_dqh[i]));
+
+ bit_mask = is_in(ep) ?
+ (1 << (ep->ep_num + 16)) : (1 << (ep->ep_num));
+
+ VDBG(dev, "bit_mask = 0x%08x\n", bit_mask);
+
+ /* check if the pipe is empty */
+ if (!(list_empty(&ep->queue))) {
+ /* add dTD to the end of linked list */
+ struct langwell_request *lastreq;
+ lastreq = list_entry(ep->queue.prev,
+ struct langwell_request, queue);
+
+ lastreq->tail->dtd_next =
+ cpu_to_le32(req->head->dtd_dma & DTD_NEXT_MASK);
+
+ /* read prime bit, if 1 goto out */
+ if (readl(&dev->op_regs->endptprime) & bit_mask)
+ goto out;
+
+ do {
+ /* set ATDTW bit in USBCMD */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ writel(usbcmd | CMD_ATDTW, &dev->op_regs->usbcmd);
+
+ /* read correct status bit */
+ endptstat = readl(&dev->op_regs->endptstat) & bit_mask;
+
+ } while (!(readl(&dev->op_regs->usbcmd) & CMD_ATDTW));
+
+ /* write ATDTW bit to 0 */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ writel(usbcmd & ~CMD_ATDTW, &dev->op_regs->usbcmd);
+
+ if (endptstat)
+ goto out;
+ }
+
+ /* write dQH next pointer and terminate bit to 0 */
+ dtd_dma = req->head->dtd_dma & DTD_NEXT_MASK;
+ dqh->dtd_next = cpu_to_le32(dtd_dma);
+
+ /* clear active and halt bit */
+ dtd_status = (u8) ~(DTD_STS_ACTIVE | DTD_STS_HALTED);
+ dqh->dtd_status &= dtd_status;
+ VDBG(dev, "dqh->dtd_status = 0x%x\n", dqh->dtd_status);
+
+ /* write 1 to endptprime register to PRIME endpoint */
+ bit_mask = is_in(ep) ? (1 << (ep->ep_num + 16)) : (1 << ep->ep_num);
+ VDBG(dev, "endprime bit_mask = 0x%08x\n", bit_mask);
+ writel(bit_mask, &dev->op_regs->endptprime);
+out:
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* fill in the dTD structure to build a transfer descriptor */
+static struct langwell_dtd *build_dtd(struct langwell_request *req,
+ unsigned *length, dma_addr_t *dma, int *is_last)
+{
+ u32 buf_ptr;
+ struct langwell_dtd *dtd;
+ struct langwell_udc *dev;
+ int i;
+
+ dev = req->ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* the maximum transfer length, up to 16k bytes */
+ *length = min(req->req.length - req->req.actual,
+ (unsigned)DTD_MAX_TRANSFER_LENGTH);
+
+ /* create dTD dma_pool resource */
+ dtd = dma_pool_alloc(dev->dtd_pool, GFP_KERNEL, dma);
+ if (dtd == NULL)
+ return dtd;
+ dtd->dtd_dma = *dma;
+
+ /* initialize buffer page pointers */
+ buf_ptr = (u32)(req->req.dma + req->req.actual);
+ for (i = 0; i < 5; i++)
+ dtd->dtd_buf[i] = cpu_to_le32(buf_ptr + i * PAGE_SIZE);
+
+ req->req.actual += *length;
+
+ /* fill in total bytes with transfer size */
+ dtd->dtd_total = cpu_to_le16(*length);
+ VDBG(dev, "dtd->dtd_total = %d\n", dtd->dtd_total);
+
+ /* set is_last flag if req->req.zero is set or not */
+ if (req->req.zero) {
+ if (*length == 0 || (*length % req->ep->ep.maxpacket) != 0)
+ *is_last = 1;
+ else
+ *is_last = 0;
+ } else if (req->req.length == req->req.actual) {
+ *is_last = 1;
+ } else
+ *is_last = 0;
+
+ if (*is_last == 0)
+ VDBG(dev, "multi-dtd request!\n");
+
+ /* set interrupt on complete bit for the last dTD */
+ if (*is_last && !req->req.no_interrupt)
+ dtd->dtd_ioc = 1;
+
+ /* set multiplier override 0 for non-ISO and non-TX endpoint */
+ dtd->dtd_multo = 0;
+
+ /* set the active bit of status field to 1 */
+ dtd->dtd_status = DTD_STS_ACTIVE;
+ VDBG(dev, "dtd->dtd_status = 0x%02x\n", dtd->dtd_status);
+
+ VDBG(dev, "length = %d, dma addr= 0x%08x\n", *length, (int)*dma);
+ VDBG(dev, "<--- %s()\n", __func__);
+ return dtd;
+}
+
+
+/* generate dTD linked list for a request */
+static int req_to_dtd(struct langwell_request *req)
+{
+ unsigned count;
+ int is_last, is_first = 1;
+ struct langwell_dtd *dtd, *last_dtd = NULL;
+ struct langwell_udc *dev;
+ dma_addr_t dma;
+
+ dev = req->ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+ do {
+ dtd = build_dtd(req, &count, &dma, &is_last);
+ if (dtd == NULL)
+ return -ENOMEM;
+
+ if (is_first) {
+ is_first = 0;
+ req->head = dtd;
+ } else {
+ last_dtd->dtd_next = cpu_to_le32(dma);
+ last_dtd->next_dtd_virt = dtd;
+ }
+ last_dtd = dtd;
+ req->dtd_count++;
+ } while (!is_last);
+
+ /* set terminate bit to 1 for the last dTD */
+ dtd->dtd_next = DTD_TERM;
+
+ req->tail = dtd;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* queue (submits) an I/O requests to an endpoint */
+static int langwell_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
+ gfp_t gfp_flags)
+{
+ struct langwell_request *req;
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+ unsigned long flags;
+ int is_iso = 0, zlflag = 0;
+
+ /* always require a cpu-view buffer */
+ req = container_of(_req, struct langwell_request, req);
+ ep = container_of(_ep, struct langwell_ep, ep);
+
+ if (!_req || !_req->complete || !_req->buf
+ || !list_empty(&req->queue)) {
+ return -EINVAL;
+ }
+
+ if (unlikely(!_ep || !ep->desc))
+ return -EINVAL;
+
+ dev = ep->dev;
+ req->ep = ep;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) {
+ if (req->req.length > ep->ep.maxpacket)
+ return -EMSGSIZE;
+ is_iso = 1;
+ }
+
+ if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN))
+ return -ESHUTDOWN;
+
+ /* set up dma mapping in case the caller didn't */
+ if (_req->dma == DMA_ADDR_INVALID) {
+ /* WORKAROUND: WARN_ON(size == 0) */
+ if (_req->length == 0) {
+ VDBG(dev, "req->length: 0->1\n");
+ zlflag = 1;
+ _req->length++;
+ }
+
+ _req->dma = dma_map_single(&dev->pdev->dev,
+ _req->buf, _req->length,
+ is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (zlflag && (_req->length == 1)) {
+ VDBG(dev, "req->length: 1->0\n");
+ zlflag = 0;
+ _req->length = 0;
+ }
+
+ req->mapped = 1;
+ VDBG(dev, "req->mapped = 1\n");
+ } else {
+ dma_sync_single_for_device(&dev->pdev->dev,
+ _req->dma, _req->length,
+ is_in(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ req->mapped = 0;
+ VDBG(dev, "req->mapped = 0\n");
+ }
+
+ DBG(dev, "%s queue req %p, len %u, buf %p, dma 0x%08x\n",
+ _ep->name,
+ _req, _req->length, _req->buf, _req->dma);
+
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+ req->dtd_count = 0;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* build and put dTDs to endpoint queue */
+ if (!req_to_dtd(req)) {
+ queue_dtd(ep, req);
+ } else {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENOMEM;
+ }
+
+ /* update ep0 state */
+ if (ep->ep_num == 0)
+ dev->ep0_state = DATA_STATE_XMIT;
+
+ if (likely(req != NULL)) {
+ list_add_tail(&req->queue, &ep->queue);
+ VDBG(dev, "list_add_tail() \n");
+ }
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* dequeue (cancels, unlinks) an I/O request from an endpoint */
+static int langwell_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+ struct langwell_request *req;
+ unsigned long flags;
+ int stopped, ep_num, retval = 0;
+ u32 endptctrl;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !ep->desc || !_req)
+ return -EINVAL;
+
+ if (!dev->driver)
+ return -ESHUTDOWN;
+
+ spin_lock_irqsave(&dev->lock, flags);
+ stopped = ep->stopped;
+
+ /* quiesce dma while we patch the queue */
+ ep->stopped = 1;
+ ep_num = ep->ep_num;
+
+ /* disable endpoint control register */
+ endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+ if (is_in(ep))
+ endptctrl &= ~EPCTRL_TXE;
+ else
+ endptctrl &= ~EPCTRL_RXE;
+ writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+ /* make sure it's still queued on this endpoint */
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (&req->req == _req)
+ break;
+ }
+
+ if (&req->req != _req) {
+ retval = -EINVAL;
+ goto done;
+ }
+
+ /* queue head may be partially complete. */
+ if (ep->queue.next == &req->queue) {
+ DBG(dev, "unlink (%s) dma\n", _ep->name);
+ _req->status = -ECONNRESET;
+ langwell_ep_fifo_flush(&ep->ep);
+
+ /* not the last request in endpoint queue */
+ if (likely(ep->queue.next == &req->queue)) {
+ struct langwell_dqh *dqh;
+ struct langwell_request *next_req;
+
+ dqh = ep->dqh;
+ next_req = list_entry(req->queue.next,
+ struct langwell_request, queue);
+
+ /* point the dQH to the first dTD of next request */
+ writel((u32) next_req->head, &dqh->dqh_current);
+ }
+ } else {
+ struct langwell_request *prev_req;
+
+ prev_req = list_entry(req->queue.prev,
+ struct langwell_request, queue);
+ writel(readl(&req->tail->dtd_next),
+ &prev_req->tail->dtd_next);
+ }
+
+ done(ep, req, -ECONNRESET);
+
+done:
+ /* enable endpoint again */
+ endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+ if (is_in(ep))
+ endptctrl |= EPCTRL_TXE;
+ else
+ endptctrl |= EPCTRL_RXE;
+ writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+ ep->stopped = stopped;
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* endpoint set/clear halt */
+static void ep_set_halt(struct langwell_ep *ep, int value)
+{
+ u32 endptctrl = 0;
+ int ep_num;
+ struct langwell_udc *dev = ep->dev;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ ep_num = ep->ep_num;
+ endptctrl = readl(&dev->op_regs->endptctrl[ep_num]);
+
+ /* value: 1 - set halt, 0 - clear halt */
+ if (value) {
+ /* set the stall bit */
+ if (is_in(ep))
+ endptctrl |= EPCTRL_TXS;
+ else
+ endptctrl |= EPCTRL_RXS;
+ } else {
+ /* clear the stall bit and reset data toggle */
+ if (is_in(ep)) {
+ endptctrl &= ~EPCTRL_TXS;
+ endptctrl |= EPCTRL_TXR;
+ } else {
+ endptctrl &= ~EPCTRL_RXS;
+ endptctrl |= EPCTRL_RXR;
+ }
+ }
+
+ writel(endptctrl, &dev->op_regs->endptctrl[ep_num]);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* set the endpoint halt feature */
+static int langwell_ep_set_halt(struct usb_ep *_ep, int value)
+{
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+ unsigned long flags;
+ int retval = 0;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !ep->desc)
+ return -EINVAL;
+
+ if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
+ return -ESHUTDOWN;
+
+ if (ep->desc && (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+ == USB_ENDPOINT_XFER_ISOC)
+ return -EOPNOTSUPP;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /*
+ * attempt to halt IN ep will fail if any transfer requests
+ * are still queue
+ */
+ if (!list_empty(&ep->queue) && is_in(ep) && value) {
+ /* IN endpoint FIFO holds bytes */
+ DBG(dev, "%s FIFO holds bytes\n", _ep->name);
+ retval = -EAGAIN;
+ goto done;
+ }
+
+ /* endpoint set/clear halt */
+ if (ep->ep_num) {
+ ep_set_halt(ep, value);
+ } else { /* endpoint 0 */
+ dev->ep0_state = WAIT_FOR_SETUP;
+ dev->ep0_dir = USB_DIR_OUT;
+ }
+done:
+ spin_unlock_irqrestore(&dev->lock, flags);
+ DBG(dev, "%s %s halt\n", _ep->name, value ? "set" : "clear");
+ VDBG(dev, "<--- %s()\n", __func__);
+ return retval;
+}
+
+
+/* set the halt feature and ignores clear requests */
+static int langwell_ep_set_wedge(struct usb_ep *_ep)
+{
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !ep->desc)
+ return -EINVAL;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return usb_ep_set_halt(_ep);
+}
+
+
+/* flush contents of a fifo */
+static void langwell_ep_fifo_flush(struct usb_ep *_ep)
+{
+ struct langwell_ep *ep;
+ struct langwell_udc *dev;
+ u32 flush_bit;
+ unsigned long timeout;
+
+ ep = container_of(_ep, struct langwell_ep, ep);
+ dev = ep->dev;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (!_ep || !ep->desc) {
+ VDBG(dev, "ep or ep->desc is NULL\n");
+ VDBG(dev, "<--- %s()\n", __func__);
+ return;
+ }
+
+ VDBG(dev, "%s-%s fifo flush\n", _ep->name, is_in(ep) ? "in" : "out");
+
+ /* flush endpoint buffer */
+ if (ep->ep_num == 0)
+ flush_bit = (1 << 16) | 1;
+ else if (is_in(ep))
+ flush_bit = 1 << (ep->ep_num + 16); /* TX */
+ else
+ flush_bit = 1 << ep->ep_num; /* RX */
+
+ /* wait until flush complete */
+ timeout = jiffies + FLUSH_TIMEOUT;
+ do {
+ writel(flush_bit, &dev->op_regs->endptflush);
+ while (readl(&dev->op_regs->endptflush)) {
+ if (time_after(jiffies, timeout)) {
+ ERROR(dev, "ep flush timeout\n");
+ goto done;
+ }
+ cpu_relax();
+ }
+ } while (readl(&dev->op_regs->endptstat) & flush_bit);
+done:
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* endpoints operations structure */
+static const struct usb_ep_ops langwell_ep_ops = {
+
+ /* configure endpoint, making it usable */
+ .enable = langwell_ep_enable,
+
+ /* endpoint is no longer usable */
+ .disable = langwell_ep_disable,
+
+ /* allocate a request object to use with this endpoint */
+ .alloc_request = langwell_alloc_request,
+
+ /* free a request object */
+ .free_request = langwell_free_request,
+
+ /* queue (submits) an I/O requests to an endpoint */
+ .queue = langwell_ep_queue,
+
+ /* dequeue (cancels, unlinks) an I/O request from an endpoint */
+ .dequeue = langwell_ep_dequeue,
+
+ /* set the endpoint halt feature */
+ .set_halt = langwell_ep_set_halt,
+
+ /* set the halt feature and ignores clear requests */
+ .set_wedge = langwell_ep_set_wedge,
+
+ /* flush contents of a fifo */
+ .fifo_flush = langwell_ep_fifo_flush,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device controller usb_gadget_ops structure */
+
+/* returns the current frame number */
+static int langwell_get_frame(struct usb_gadget *_gadget)
+{
+ struct langwell_udc *dev;
+ u16 retval;
+
+ if (!_gadget)
+ return -ENODEV;
+
+ dev = container_of(_gadget, struct langwell_udc, gadget);
+ VDBG(dev, "---> %s()\n", __func__);
+
+ retval = readl(&dev->op_regs->frindex) & FRINDEX_MASK;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return retval;
+}
+
+
+/* tries to wake up the host connected to this gadget */
+static int langwell_wakeup(struct usb_gadget *_gadget)
+{
+ struct langwell_udc *dev;
+ u32 portsc1, devlc;
+ unsigned long flags;
+
+ if (!_gadget)
+ return 0;
+
+ dev = container_of(_gadget, struct langwell_udc, gadget);
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* Remote Wakeup feature not enabled by host */
+ if (!dev->remote_wakeup)
+ return -ENOTSUPP;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ portsc1 = readl(&dev->op_regs->portsc1);
+ if (!(portsc1 & PORTS_SUSP)) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return 0;
+ }
+
+ /* LPM L1 to L0, remote wakeup */
+ if (dev->lpm && dev->lpm_state == LPM_L1) {
+ portsc1 |= PORTS_SLP;
+ writel(portsc1, &dev->op_regs->portsc1);
+ }
+
+ /* force port resume */
+ if (dev->usb_state == USB_STATE_SUSPENDED) {
+ portsc1 |= PORTS_FPR;
+ writel(portsc1, &dev->op_regs->portsc1);
+ }
+
+ /* exit PHY low power suspend */
+ devlc = readl(&dev->op_regs->devlc);
+ VDBG(dev, "devlc = 0x%08x\n", devlc);
+ devlc &= ~LPM_PHCD;
+ writel(devlc, &dev->op_regs->devlc);
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* notify controller that VBUS is powered or not */
+static int langwell_vbus_session(struct usb_gadget *_gadget, int is_active)
+{
+ struct langwell_udc *dev;
+ unsigned long flags;
+ u32 usbcmd;
+
+ if (!_gadget)
+ return -ENODEV;
+
+ dev = container_of(_gadget, struct langwell_udc, gadget);
+ VDBG(dev, "---> %s()\n", __func__);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ VDBG(dev, "VBUS status: %s\n", is_active ? "on" : "off");
+
+ dev->vbus_active = (is_active != 0);
+ if (dev->driver && dev->softconnected && dev->vbus_active) {
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd |= CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+ } else {
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd &= ~CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+ }
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* constrain controller's VBUS power usage */
+static int langwell_vbus_draw(struct usb_gadget *_gadget, unsigned mA)
+{
+ struct langwell_udc *dev;
+
+ if (!_gadget)
+ return -ENODEV;
+
+ dev = container_of(_gadget, struct langwell_udc, gadget);
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (dev->transceiver) {
+ VDBG(dev, "otg_set_power\n");
+ VDBG(dev, "<--- %s()\n", __func__);
+ return otg_set_power(dev->transceiver, mA);
+ }
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return -ENOTSUPP;
+}
+
+
+/* D+ pullup, software-controlled connect/disconnect to USB host */
+static int langwell_pullup(struct usb_gadget *_gadget, int is_on)
+{
+ struct langwell_udc *dev;
+ u32 usbcmd;
+ unsigned long flags;
+
+ if (!_gadget)
+ return -ENODEV;
+
+ dev = container_of(_gadget, struct langwell_udc, gadget);
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ spin_lock_irqsave(&dev->lock, flags);
+ dev->softconnected = (is_on != 0);
+
+ if (dev->driver && dev->softconnected && dev->vbus_active) {
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd |= CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+ } else {
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd &= ~CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+ }
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* device controller usb_gadget_ops structure */
+static const struct usb_gadget_ops langwell_ops = {
+
+ /* returns the current frame number */
+ .get_frame = langwell_get_frame,
+
+ /* tries to wake up the host connected to this gadget */
+ .wakeup = langwell_wakeup,
+
+ /* set the device selfpowered feature, always selfpowered */
+ /* .set_selfpowered = langwell_set_selfpowered, */
+
+ /* notify controller that VBUS is powered or not */
+ .vbus_session = langwell_vbus_session,
+
+ /* constrain controller's VBUS power usage */
+ .vbus_draw = langwell_vbus_draw,
+
+ /* D+ pullup, software-controlled connect/disconnect to USB host */
+ .pullup = langwell_pullup,
+};
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device controller operations */
+
+/* reset device controller */
+static int langwell_udc_reset(struct langwell_udc *dev)
+{
+ u32 usbcmd, usbmode, devlc, endpointlistaddr;
+ unsigned long timeout;
+
+ if (!dev)
+ return -EINVAL;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ /* set controller to stop state */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd &= ~CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+
+ /* reset device controller */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd |= CMD_RST;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+
+ /* wait for reset to complete */
+ timeout = jiffies + RESET_TIMEOUT;
+ while (readl(&dev->op_regs->usbcmd) & CMD_RST) {
+ if (time_after(jiffies, timeout)) {
+ ERROR(dev, "device reset timeout\n");
+ return -ETIMEDOUT;
+ }
+ cpu_relax();
+ }
+
+ /* set controller to device mode */
+ usbmode = readl(&dev->op_regs->usbmode);
+ usbmode |= MODE_DEVICE;
+
+ /* turn setup lockout off, require setup tripwire in usbcmd */
+ usbmode |= MODE_SLOM;
+
+ writel(usbmode, &dev->op_regs->usbmode);
+ usbmode = readl(&dev->op_regs->usbmode);
+ VDBG(dev, "usbmode=0x%08x\n", usbmode);
+
+ /* Write-Clear setup status */
+ writel(0, &dev->op_regs->usbsts);
+
+ /* if support USB LPM, ACK all LPM token */
+ if (dev->lpm) {
+ devlc = readl(&dev->op_regs->devlc);
+ devlc &= ~LPM_STL; /* don't STALL LPM token */
+ devlc &= ~LPM_NYT_ACK; /* ACK LPM token */
+ writel(devlc, &dev->op_regs->devlc);
+ }
+
+ /* fill endpointlistaddr register */
+ endpointlistaddr = dev->ep_dqh_dma;
+ endpointlistaddr &= ENDPOINTLISTADDR_MASK;
+ writel(endpointlistaddr, &dev->op_regs->endpointlistaddr);
+
+ VDBG(dev, "dQH base (vir: %p, phy: 0x%08x), endpointlistaddr=0x%08x\n",
+ dev->ep_dqh, endpointlistaddr,
+ readl(&dev->op_regs->endpointlistaddr));
+ DBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* reinitialize device controller endpoints */
+static int eps_reinit(struct langwell_udc *dev)
+{
+ struct langwell_ep *ep;
+ char name[14];
+ int i;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* initialize ep0 */
+ ep = &dev->ep[0];
+ ep->dev = dev;
+ strncpy(ep->name, "ep0", sizeof(ep->name));
+ ep->ep.name = ep->name;
+ ep->ep.ops = &langwell_ep_ops;
+ ep->stopped = 0;
+ ep->ep.maxpacket = EP0_MAX_PKT_SIZE;
+ ep->ep_num = 0;
+ ep->desc = &langwell_ep0_desc;
+ INIT_LIST_HEAD(&ep->queue);
+
+ ep->ep_type = USB_ENDPOINT_XFER_CONTROL;
+
+ /* initialize other endpoints */
+ for (i = 2; i < dev->ep_max; i++) {
+ ep = &dev->ep[i];
+ if (i % 2)
+ snprintf(name, sizeof(name), "ep%din", i / 2);
+ else
+ snprintf(name, sizeof(name), "ep%dout", i / 2);
+ ep->dev = dev;
+ strncpy(ep->name, name, sizeof(ep->name));
+ ep->ep.name = ep->name;
+
+ ep->ep.ops = &langwell_ep_ops;
+ ep->stopped = 0;
+ ep->ep.maxpacket = (unsigned short) ~0;
+ ep->ep_num = i / 2;
+
+ INIT_LIST_HEAD(&ep->queue);
+ list_add_tail(&ep->ep.ep_list, &dev->gadget.ep_list);
+
+ ep->dqh = &dev->ep_dqh[i];
+ }
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* enable interrupt and set controller to run state */
+static void langwell_udc_start(struct langwell_udc *dev)
+{
+ u32 usbintr, usbcmd;
+ DBG(dev, "---> %s()\n", __func__);
+
+ /* enable interrupts */
+ usbintr = INTR_ULPIE /* ULPI */
+ | INTR_SLE /* suspend */
+ /* | INTR_SRE SOF received */
+ | INTR_URE /* USB reset */
+ | INTR_AAE /* async advance */
+ | INTR_SEE /* system error */
+ | INTR_FRE /* frame list rollover */
+ | INTR_PCE /* port change detect */
+ | INTR_UEE /* USB error interrupt */
+ | INTR_UE; /* USB interrupt */
+ writel(usbintr, &dev->op_regs->usbintr);
+
+ /* clear stopped bit */
+ dev->stopped = 0;
+
+ /* set controller to run */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd |= CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+
+ DBG(dev, "<--- %s()\n", __func__);
+ return;
+}
+
+
+/* disable interrupt and set controller to stop state */
+static void langwell_udc_stop(struct langwell_udc *dev)
+{
+ u32 usbcmd;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ /* disable all interrupts */
+ writel(0, &dev->op_regs->usbintr);
+
+ /* set stopped bit */
+ dev->stopped = 1;
+
+ /* set controller to stop state */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ usbcmd &= ~CMD_RUNSTOP;
+ writel(usbcmd, &dev->op_regs->usbcmd);
+
+ DBG(dev, "<--- %s()\n", __func__);
+ return;
+}
+
+
+/* stop all USB activities */
+static void stop_activity(struct langwell_udc *dev,
+ struct usb_gadget_driver *driver)
+{
+ struct langwell_ep *ep;
+ DBG(dev, "---> %s()\n", __func__);
+
+ nuke(&dev->ep[0], -ESHUTDOWN);
+
+ list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+ nuke(ep, -ESHUTDOWN);
+ }
+
+ /* report disconnect; the driver is already quiesced */
+ if (driver) {
+ spin_unlock(&dev->lock);
+ driver->disconnect(&dev->gadget);
+ spin_lock(&dev->lock);
+ }
+
+ DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* device "function" sysfs attribute file */
+static ssize_t show_function(struct device *_dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct langwell_udc *dev = the_controller;
+
+ if (!dev->driver || !dev->driver->function
+ || strlen(dev->driver->function) > PAGE_SIZE)
+ return 0;
+
+ return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
+}
+static DEVICE_ATTR(function, S_IRUGO, show_function, NULL);
+
+
+/* device "langwell_udc" sysfs attribute file */
+static ssize_t show_langwell_udc(struct device *_dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct langwell_udc *dev = the_controller;
+ struct langwell_request *req;
+ struct langwell_ep *ep = NULL;
+ char *next;
+ unsigned size;
+ unsigned t;
+ unsigned i;
+ unsigned long flags;
+ u32 tmp_reg;
+
+ next = buf;
+ size = PAGE_SIZE;
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* driver basic information */
+ t = scnprintf(next, size,
+ DRIVER_DESC "\n"
+ "%s version: %s\n"
+ "Gadget driver: %s\n\n",
+ driver_name, DRIVER_VERSION,
+ dev->driver ? dev->driver->driver.name : "(none)");
+ size -= t;
+ next += t;
+
+ /* device registers */
+ tmp_reg = readl(&dev->op_regs->usbcmd);
+ t = scnprintf(next, size,
+ "USBCMD reg:\n"
+ "SetupTW: %d\n"
+ "Run/Stop: %s\n\n",
+ (tmp_reg & CMD_SUTW) ? 1 : 0,
+ (tmp_reg & CMD_RUNSTOP) ? "Run" : "Stop");
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->usbsts);
+ t = scnprintf(next, size,
+ "USB Status Reg:\n"
+ "Device Suspend: %d\n"
+ "Reset Received: %d\n"
+ "System Error: %s\n"
+ "USB Error Interrupt: %s\n\n",
+ (tmp_reg & STS_SLI) ? 1 : 0,
+ (tmp_reg & STS_URI) ? 1 : 0,
+ (tmp_reg & STS_SEI) ? "Error" : "No error",
+ (tmp_reg & STS_UEI) ? "Error detected" : "No error");
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->usbintr);
+ t = scnprintf(next, size,
+ "USB Intrrupt Enable Reg:\n"
+ "Sleep Enable: %d\n"
+ "SOF Received Enable: %d\n"
+ "Reset Enable: %d\n"
+ "System Error Enable: %d\n"
+ "Port Change Dectected Enable: %d\n"
+ "USB Error Intr Enable: %d\n"
+ "USB Intr Enable: %d\n\n",
+ (tmp_reg & INTR_SLE) ? 1 : 0,
+ (tmp_reg & INTR_SRE) ? 1 : 0,
+ (tmp_reg & INTR_URE) ? 1 : 0,
+ (tmp_reg & INTR_SEE) ? 1 : 0,
+ (tmp_reg & INTR_PCE) ? 1 : 0,
+ (tmp_reg & INTR_UEE) ? 1 : 0,
+ (tmp_reg & INTR_UE) ? 1 : 0);
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->frindex);
+ t = scnprintf(next, size,
+ "USB Frame Index Reg:\n"
+ "Frame Number is 0x%08x\n\n",
+ (tmp_reg & FRINDEX_MASK));
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->deviceaddr);
+ t = scnprintf(next, size,
+ "USB Device Address Reg:\n"
+ "Device Addr is 0x%x\n\n",
+ USBADR(tmp_reg));
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->endpointlistaddr);
+ t = scnprintf(next, size,
+ "USB Endpoint List Address Reg:\n"
+ "Endpoint List Pointer is 0x%x\n\n",
+ EPBASE(tmp_reg));
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->portsc1);
+ t = scnprintf(next, size,
+ "USB Port Status & Control Reg:\n"
+ "Port Reset: %s\n"
+ "Port Suspend Mode: %s\n"
+ "Over-current Change: %s\n"
+ "Port Enable/Disable Change: %s\n"
+ "Port Enabled/Disabled: %s\n"
+ "Current Connect Status: %s\n\n",
+ (tmp_reg & PORTS_PR) ? "Reset" : "Not Reset",
+ (tmp_reg & PORTS_SUSP) ? "Suspend " : "Not Suspend",
+ (tmp_reg & PORTS_OCC) ? "Detected" : "No",
+ (tmp_reg & PORTS_PEC) ? "Changed" : "Not Changed",
+ (tmp_reg & PORTS_PE) ? "Enable" : "Not Correct",
+ (tmp_reg & PORTS_CCS) ? "Attached" : "Not Attached");
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->devlc);
+ t = scnprintf(next, size,
+ "Device LPM Control Reg:\n"
+ "Parallel Transceiver : %d\n"
+ "Serial Transceiver : %d\n"
+ "Port Speed: %s\n"
+ "Port Force Full Speed Connenct: %s\n"
+ "PHY Low Power Suspend Clock Disable: %s\n"
+ "BmAttributes: %d\n\n",
+ LPM_PTS(tmp_reg),
+ (tmp_reg & LPM_STS) ? 1 : 0,
+ ({
+ char *s;
+ switch (LPM_PSPD(tmp_reg)) {
+ case LPM_SPEED_FULL:
+ s = "Full Speed"; break;
+ case LPM_SPEED_LOW:
+ s = "Low Speed"; break;
+ case LPM_SPEED_HIGH:
+ s = "High Speed"; break;
+ default:
+ s = "Unknown Speed"; break;
+ }
+ s;
+ }),
+ (tmp_reg & LPM_PFSC) ? "Force Full Speed" : "Not Force",
+ (tmp_reg & LPM_PHCD) ? "Disabled" : "Enabled",
+ LPM_BA(tmp_reg));
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->usbmode);
+ t = scnprintf(next, size,
+ "USB Mode Reg:\n"
+ "Controller Mode is : %s\n\n", ({
+ char *s;
+ switch (MODE_CM(tmp_reg)) {
+ case MODE_IDLE:
+ s = "Idle"; break;
+ case MODE_DEVICE:
+ s = "Device Controller"; break;
+ case MODE_HOST:
+ s = "Host Controller"; break;
+ default:
+ s = "None"; break;
+ }
+ s;
+ }));
+ size -= t;
+ next += t;
+
+ tmp_reg = readl(&dev->op_regs->endptsetupstat);
+ t = scnprintf(next, size,
+ "Endpoint Setup Status Reg:\n"
+ "SETUP on ep 0x%04x\n\n",
+ tmp_reg & SETUPSTAT_MASK);
+ size -= t;
+ next += t;
+
+ for (i = 0; i < dev->ep_max / 2; i++) {
+ tmp_reg = readl(&dev->op_regs->endptctrl[i]);
+ t = scnprintf(next, size, "EP Ctrl Reg [%d]: 0x%08x\n",
+ i, tmp_reg);
+ size -= t;
+ next += t;
+ }
+ tmp_reg = readl(&dev->op_regs->endptprime);
+ t = scnprintf(next, size, "EP Prime Reg: 0x%08x\n\n", tmp_reg);
+ size -= t;
+ next += t;
+
+ /* langwell_udc, langwell_ep, langwell_request structure information */
+ ep = &dev->ep[0];
+ t = scnprintf(next, size, "%s MaxPacketSize: 0x%x, ep_num: %d\n",
+ ep->ep.name, ep->ep.maxpacket, ep->ep_num);
+ size -= t;
+ next += t;
+
+ if (list_empty(&ep->queue)) {
+ t = scnprintf(next, size, "its req queue is empty\n\n");
+ size -= t;
+ next += t;
+ } else {
+ list_for_each_entry(req, &ep->queue, queue) {
+ t = scnprintf(next, size,
+ "req %p actual 0x%x length 0x%x buf %p\n",
+ &req->req, req->req.actual,
+ req->req.length, req->req.buf);
+ size -= t;
+ next += t;
+ }
+ }
+ /* other gadget->eplist ep */
+ list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+ if (ep->desc) {
+ t = scnprintf(next, size,
+ "\n%s MaxPacketSize: 0x%x, "
+ "ep_num: %d\n",
+ ep->ep.name, ep->ep.maxpacket,
+ ep->ep_num);
+ size -= t;
+ next += t;
+
+ if (list_empty(&ep->queue)) {
+ t = scnprintf(next, size,
+ "its req queue is empty\n\n");
+ size -= t;
+ next += t;
+ } else {
+ list_for_each_entry(req, &ep->queue, queue) {
+ t = scnprintf(next, size,
+ "req %p actual 0x%x length "
+ "0x%x buf %p\n",
+ &req->req, req->req.actual,
+ req->req.length, req->req.buf);
+ size -= t;
+ next += t;
+ }
+ }
+ }
+ }
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return PAGE_SIZE - size;
+}
+static DEVICE_ATTR(langwell_udc, S_IRUGO, show_langwell_udc, NULL);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * when a driver is successfully registered, it will receive
+ * control requests including set_configuration(), which enables
+ * non-control requests. then usb traffic follows until a
+ * disconnect is reported. then a host may connect again, or
+ * the driver might get unbound.
+ */
+
+int usb_gadget_register_driver(struct usb_gadget_driver *driver)
+{
+ struct langwell_udc *dev = the_controller;
+ unsigned long flags;
+ int retval;
+
+ if (!dev)
+ return -ENODEV;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ if (dev->driver)
+ return -EBUSY;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* hook up the driver ... */
+ driver->driver.bus = NULL;
+ dev->driver = driver;
+ dev->gadget.dev.driver = &driver->driver;
+
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ retval = driver->bind(&dev->gadget);
+ if (retval) {
+ DBG(dev, "bind to driver %s --> %d\n",
+ driver->driver.name, retval);
+ dev->driver = NULL;
+ dev->gadget.dev.driver = NULL;
+ return retval;
+ }
+
+ retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
+ if (retval)
+ goto err_unbind;
+
+ dev->usb_state = USB_STATE_ATTACHED;
+ dev->ep0_state = WAIT_FOR_SETUP;
+ dev->ep0_dir = USB_DIR_OUT;
+
+ /* enable interrupt and set controller to run state */
+ if (dev->got_irq)
+ langwell_udc_start(dev);
+
+ VDBG(dev, "After langwell_udc_start(), print all registers:\n");
+#ifdef VERBOSE
+ print_all_registers(dev);
+#endif
+
+ INFO(dev, "register driver: %s\n", driver->driver.name);
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+
+err_unbind:
+ driver->unbind(&dev->gadget);
+ dev->gadget.dev.driver = NULL;
+ dev->driver = NULL;
+
+ DBG(dev, "<--- %s()\n", __func__);
+ return retval;
+}
+EXPORT_SYMBOL(usb_gadget_register_driver);
+
+
+/* unregister gadget driver */
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+ struct langwell_udc *dev = the_controller;
+ unsigned long flags;
+
+ if (!dev)
+ return -ENODEV;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ if (unlikely(!driver || !driver->bind || !driver->unbind))
+ return -EINVAL;
+
+ /* unbind OTG transceiver */
+ if (dev->transceiver)
+ (void)otg_set_peripheral(dev->transceiver, 0);
+
+ /* disable interrupt and set controller to stop state */
+ langwell_udc_stop(dev);
+
+ dev->usb_state = USB_STATE_ATTACHED;
+ dev->ep0_state = WAIT_FOR_SETUP;
+ dev->ep0_dir = USB_DIR_OUT;
+
+ spin_lock_irqsave(&dev->lock, flags);
+
+ /* stop all usb activities */
+ dev->gadget.speed = USB_SPEED_UNKNOWN;
+ stop_activity(dev, driver);
+ spin_unlock_irqrestore(&dev->lock, flags);
+
+ /* unbind gadget driver */
+ driver->unbind(&dev->gadget);
+ dev->gadget.dev.driver = NULL;
+ dev->driver = NULL;
+
+ device_remove_file(&dev->pdev->dev, &dev_attr_function);
+
+ INFO(dev, "unregistered driver '%s'\n", driver->driver.name);
+ DBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * setup tripwire is used as a semaphore to ensure that the setup data
+ * payload is extracted from a dQH without being corrupted
+ */
+static void setup_tripwire(struct langwell_udc *dev)
+{
+ u32 usbcmd,
+ endptsetupstat;
+ unsigned long timeout;
+ struct langwell_dqh *dqh;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* ep0 OUT dQH */
+ dqh = &dev->ep_dqh[EP_DIR_OUT];
+
+ /* Write-Clear endptsetupstat */
+ endptsetupstat = readl(&dev->op_regs->endptsetupstat);
+ writel(endptsetupstat, &dev->op_regs->endptsetupstat);
+
+ /* wait until endptsetupstat is cleared */
+ timeout = jiffies + SETUPSTAT_TIMEOUT;
+ while (readl(&dev->op_regs->endptsetupstat)) {
+ if (time_after(jiffies, timeout)) {
+ ERROR(dev, "setup_tripwire timeout\n");
+ break;
+ }
+ cpu_relax();
+ }
+
+ /* while a hazard exists when setup packet arrives */
+ do {
+ /* set setup tripwire bit */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ writel(usbcmd | CMD_SUTW, &dev->op_regs->usbcmd);
+
+ /* copy the setup packet to local buffer */
+ memcpy(&dev->local_setup_buff, &dqh->dqh_setup, 8);
+ } while (!(readl(&dev->op_regs->usbcmd) & CMD_SUTW));
+
+ /* Write-Clear setup tripwire bit */
+ usbcmd = readl(&dev->op_regs->usbcmd);
+ writel(usbcmd & ~CMD_SUTW, &dev->op_regs->usbcmd);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* protocol ep0 stall, will automatically be cleared on new transaction */
+static void ep0_stall(struct langwell_udc *dev)
+{
+ u32 endptctrl;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* set TX and RX to stall */
+ endptctrl = readl(&dev->op_regs->endptctrl[0]);
+ endptctrl |= EPCTRL_TXS | EPCTRL_RXS;
+ writel(endptctrl, &dev->op_regs->endptctrl[0]);
+
+ /* update ep0 state */
+ dev->ep0_state = WAIT_FOR_SETUP;
+ dev->ep0_dir = USB_DIR_OUT;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* PRIME a status phase for ep0 */
+static int prime_status_phase(struct langwell_udc *dev, int dir)
+{
+ struct langwell_request *req;
+ struct langwell_ep *ep;
+ int status = 0;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (dir == EP_DIR_IN)
+ dev->ep0_dir = USB_DIR_IN;
+ else
+ dev->ep0_dir = USB_DIR_OUT;
+
+ ep = &dev->ep[0];
+ dev->ep0_state = WAIT_FOR_OUT_STATUS;
+
+ req = dev->status_req;
+
+ req->ep = ep;
+ req->req.length = 0;
+ req->req.status = -EINPROGRESS;
+ req->req.actual = 0;
+ req->req.complete = NULL;
+ req->dtd_count = 0;
+
+ if (!req_to_dtd(req))
+ status = queue_dtd(ep, req);
+ else
+ return -ENOMEM;
+
+ if (status)
+ ERROR(dev, "can't queue ep0 status request\n");
+
+ list_add_tail(&req->queue, &ep->queue);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return status;
+}
+
+
+/* SET_ADDRESS request routine */
+static void set_address(struct langwell_udc *dev, u16 value,
+ u16 index, u16 length)
+{
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* save the new address to device struct */
+ dev->dev_addr = (u8) value;
+ VDBG(dev, "dev->dev_addr = %d\n", dev->dev_addr);
+
+ /* update usb state */
+ dev->usb_state = USB_STATE_ADDRESS;
+
+ /* STATUS phase */
+ if (prime_status_phase(dev, EP_DIR_IN))
+ ep0_stall(dev);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* return endpoint by windex */
+static struct langwell_ep *get_ep_by_windex(struct langwell_udc *dev,
+ u16 wIndex)
+{
+ struct langwell_ep *ep;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
+ return &dev->ep[0];
+
+ list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
+ u8 bEndpointAddress;
+ if (!ep->desc)
+ continue;
+
+ bEndpointAddress = ep->desc->bEndpointAddress;
+ if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
+ continue;
+
+ if ((wIndex & USB_ENDPOINT_NUMBER_MASK)
+ == (bEndpointAddress & USB_ENDPOINT_NUMBER_MASK))
+ return ep;
+ }
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return NULL;
+}
+
+
+/* return whether endpoint is stalled, 0: not stalled; 1: stalled */
+static int ep_is_stall(struct langwell_ep *ep)
+{
+ struct langwell_udc *dev = ep->dev;
+ u32 endptctrl;
+ int retval;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ endptctrl = readl(&dev->op_regs->endptctrl[ep->ep_num]);
+ if (is_in(ep))
+ retval = endptctrl & EPCTRL_TXS ? 1 : 0;
+ else
+ retval = endptctrl & EPCTRL_RXS ? 1 : 0;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return retval;
+}
+
+
+/* GET_STATUS request routine */
+static void get_status(struct langwell_udc *dev, u8 request_type, u16 value,
+ u16 index, u16 length)
+{
+ struct langwell_request *req;
+ struct langwell_ep *ep;
+ u16 status_data = 0; /* 16 bits cpu view status data */
+ int status = 0;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ ep = &dev->ep[0];
+
+ if ((request_type & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
+ /* get device status */
+ status_data = 1 << USB_DEVICE_SELF_POWERED;
+ status_data |= dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP;
+ } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_INTERFACE) {
+ /* get interface status */
+ status_data = 0;
+ } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_ENDPOINT) {
+ /* get endpoint status */
+ struct langwell_ep *epn;
+ epn = get_ep_by_windex(dev, index);
+ /* stall if endpoint doesn't exist */
+ if (!epn)
+ goto stall;
+
+ status_data = ep_is_stall(epn) << USB_ENDPOINT_HALT;
+ }
+
+ dev->ep0_dir = USB_DIR_IN;
+
+ /* borrow the per device status_req */
+ req = dev->status_req;
+
+ /* fill in the reqest structure */
+ *((u16 *) req->req.buf) = cpu_to_le16(status_data);
+ req->ep = ep;
+ req->req.length = 2;
+ req->req.status = -EINPROGRESS;
+ req->req.actual = 0;
+ req->req.complete = NULL;
+ req->dtd_count = 0;
+
+ /* prime the data phase */
+ if (!req_to_dtd(req))
+ status = queue_dtd(ep, req);
+ else /* no mem */
+ goto stall;
+
+ if (status) {
+ ERROR(dev, "response error on GET_STATUS request\n");
+ goto stall;
+ }
+
+ list_add_tail(&req->queue, &ep->queue);
+ dev->ep0_state = DATA_STATE_XMIT;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return;
+stall:
+ ep0_stall(dev);
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* setup packet interrupt handler */
+static void handle_setup_packet(struct langwell_udc *dev,
+ struct usb_ctrlrequest *setup)
+{
+ u16 wValue = le16_to_cpu(setup->wValue);
+ u16 wIndex = le16_to_cpu(setup->wIndex);
+ u16 wLength = le16_to_cpu(setup->wLength);
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* ep0 fifo flush */
+ nuke(&dev->ep[0], -ESHUTDOWN);
+
+ DBG(dev, "SETUP %02x.%02x v%04x i%04x l%04x\n",
+ setup->bRequestType, setup->bRequest,
+ wValue, wIndex, wLength);
+
+ /* RNDIS gadget delegate */
+ if ((setup->bRequestType == 0x21) && (setup->bRequest == 0x00)) {
+ /* USB_CDC_SEND_ENCAPSULATED_COMMAND */
+ goto delegate;
+ }
+
+ /* USB_CDC_GET_ENCAPSULATED_RESPONSE */
+ if ((setup->bRequestType == 0xa1) && (setup->bRequest == 0x01)) {
+ /* USB_CDC_GET_ENCAPSULATED_RESPONSE */
+ goto delegate;
+ }
+
+ /* We process some stardard setup requests here */
+ switch (setup->bRequest) {
+ case USB_REQ_GET_STATUS:
+ DBG(dev, "SETUP: USB_REQ_GET_STATUS\n");
+ /* get status, DATA and STATUS phase */
+ if ((setup->bRequestType & (USB_DIR_IN | USB_TYPE_MASK))
+ != (USB_DIR_IN | USB_TYPE_STANDARD))
+ break;
+ get_status(dev, setup->bRequestType, wValue, wIndex, wLength);
+ goto end;
+
+ case USB_REQ_SET_ADDRESS:
+ DBG(dev, "SETUP: USB_REQ_SET_ADDRESS\n");
+ /* STATUS phase */
+ if (setup->bRequestType != (USB_DIR_OUT | USB_TYPE_STANDARD
+ | USB_RECIP_DEVICE))
+ break;
+ set_address(dev, wValue, wIndex, wLength);
+ goto end;
+
+ case USB_REQ_CLEAR_FEATURE:
+ case USB_REQ_SET_FEATURE:
+ /* STATUS phase */
+ {
+ int rc = -EOPNOTSUPP;
+ if (setup->bRequest == USB_REQ_SET_FEATURE)
+ DBG(dev, "SETUP: USB_REQ_SET_FEATURE\n");
+ else if (setup->bRequest == USB_REQ_CLEAR_FEATURE)
+ DBG(dev, "SETUP: USB_REQ_CLEAR_FEATURE\n");
+
+ if ((setup->bRequestType & (USB_RECIP_MASK | USB_TYPE_MASK))
+ == (USB_RECIP_ENDPOINT | USB_TYPE_STANDARD)) {
+ struct langwell_ep *epn;
+ epn = get_ep_by_windex(dev, wIndex);
+ /* stall if endpoint doesn't exist */
+ if (!epn) {
+ ep0_stall(dev);
+ goto end;
+ }
+
+ if (wValue != 0 || wLength != 0
+ || epn->ep_num > dev->ep_max)
+ break;
+
+ spin_unlock(&dev->lock);
+ rc = langwell_ep_set_halt(&epn->ep,
+ (setup->bRequest == USB_REQ_SET_FEATURE)
+ ? 1 : 0);
+ spin_lock(&dev->lock);
+
+ } else if ((setup->bRequestType & (USB_RECIP_MASK
+ | USB_TYPE_MASK)) == (USB_RECIP_DEVICE
+ | USB_TYPE_STANDARD)) {
+ if (!gadget_is_otg(&dev->gadget))
+ break;
+ else if (setup->bRequest == USB_DEVICE_B_HNP_ENABLE) {
+ dev->gadget.b_hnp_enable = 1;
+#ifdef OTG_TRANSCEIVER
+ if (!dev->lotg->otg.default_a)
+ dev->lotg->hsm.b_hnp_enable = 1;
+#endif
+ } else if (setup->bRequest == USB_DEVICE_A_HNP_SUPPORT)
+ dev->gadget.a_hnp_support = 1;
+ else if (setup->bRequest ==
+ USB_DEVICE_A_ALT_HNP_SUPPORT)
+ dev->gadget.a_alt_hnp_support = 1;
+ else
+ break;
+ rc = 0;
+ } else
+ break;
+
+ if (rc == 0) {
+ if (prime_status_phase(dev, EP_DIR_IN))
+ ep0_stall(dev);
+ }
+ goto end;
+ }
+
+ case USB_REQ_GET_DESCRIPTOR:
+ DBG(dev, "SETUP: USB_REQ_GET_DESCRIPTOR\n");
+ goto delegate;
+
+ case USB_REQ_SET_DESCRIPTOR:
+ DBG(dev, "SETUP: USB_REQ_SET_DESCRIPTOR unsupported\n");
+ goto delegate;
+
+ case USB_REQ_GET_CONFIGURATION:
+ DBG(dev, "SETUP: USB_REQ_GET_CONFIGURATION\n");
+ goto delegate;
+
+ case USB_REQ_SET_CONFIGURATION:
+ DBG(dev, "SETUP: USB_REQ_SET_CONFIGURATION\n");
+ goto delegate;
+
+ case USB_REQ_GET_INTERFACE:
+ DBG(dev, "SETUP: USB_REQ_GET_INTERFACE\n");
+ goto delegate;
+
+ case USB_REQ_SET_INTERFACE:
+ DBG(dev, "SETUP: USB_REQ_SET_INTERFACE\n");
+ goto delegate;
+
+ case USB_REQ_SYNCH_FRAME:
+ DBG(dev, "SETUP: USB_REQ_SYNCH_FRAME unsupported\n");
+ goto delegate;
+
+ default:
+ /* delegate USB standard requests to the gadget driver */
+ goto delegate;
+delegate:
+ /* USB requests handled by gadget */
+ if (wLength) {
+ /* DATA phase from gadget, STATUS phase from udc */
+ dev->ep0_dir = (setup->bRequestType & USB_DIR_IN)
+ ? USB_DIR_IN : USB_DIR_OUT;
+ VDBG(dev, "dev->ep0_dir = 0x%x, wLength = %d\n",
+ dev->ep0_dir, wLength);
+ spin_unlock(&dev->lock);
+ if (dev->driver->setup(&dev->gadget,
+ &dev->local_setup_buff) < 0)
+ ep0_stall(dev);
+ spin_lock(&dev->lock);
+ dev->ep0_state = (setup->bRequestType & USB_DIR_IN)
+ ? DATA_STATE_XMIT : DATA_STATE_RECV;
+ } else {
+ /* no DATA phase, IN STATUS phase from gadget */
+ dev->ep0_dir = USB_DIR_IN;
+ VDBG(dev, "dev->ep0_dir = 0x%x, wLength = %d\n",
+ dev->ep0_dir, wLength);
+ spin_unlock(&dev->lock);
+ if (dev->driver->setup(&dev->gadget,
+ &dev->local_setup_buff) < 0)
+ ep0_stall(dev);
+ spin_lock(&dev->lock);
+ dev->ep0_state = WAIT_FOR_OUT_STATUS;
+ }
+ break;
+ }
+end:
+ VDBG(dev, "<--- %s()\n", __func__);
+ return;
+}
+
+
+/* transfer completion, process endpoint request and free the completed dTDs
+ * for this request
+ */
+static int process_ep_req(struct langwell_udc *dev, int index,
+ struct langwell_request *curr_req)
+{
+ struct langwell_dtd *curr_dtd;
+ struct langwell_dqh *curr_dqh;
+ int td_complete, actual, remaining_length;
+ int i, dir;
+ u8 dtd_status = 0;
+ int retval = 0;
+
+ curr_dqh = &dev->ep_dqh[index];
+ dir = index % 2;
+
+ curr_dtd = curr_req->head;
+ td_complete = 0;
+ actual = curr_req->req.length;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ for (i = 0; i < curr_req->dtd_count; i++) {
+ remaining_length = le16_to_cpu(curr_dtd->dtd_total);
+ actual -= remaining_length;
+
+ /* command execution states by dTD */
+ dtd_status = curr_dtd->dtd_status;
+
+ if (!dtd_status) {
+ /* transfers completed successfully */
+ if (!remaining_length) {
+ td_complete++;
+ VDBG(dev, "dTD transmitted successfully\n");
+ } else {
+ if (dir) {
+ VDBG(dev, "TX dTD remains data\n");
+ retval = -EPROTO;
+ break;
+
+ } else {
+ td_complete++;
+ break;
+ }
+ }
+ } else {
+ /* transfers completed with errors */
+ if (dtd_status & DTD_STS_ACTIVE) {
+ DBG(dev, "request not completed\n");
+ retval = 1;
+ return retval;
+ } else if (dtd_status & DTD_STS_HALTED) {
+ ERROR(dev, "dTD error %08x dQH[%d]\n",
+ dtd_status, index);
+ /* clear the errors and halt condition */
+ curr_dqh->dtd_status = 0;
+ retval = -EPIPE;
+ break;
+ } else if (dtd_status & DTD_STS_DBE) {
+ DBG(dev, "data buffer (overflow) error\n");
+ retval = -EPROTO;
+ break;
+ } else if (dtd_status & DTD_STS_TRE) {
+ DBG(dev, "transaction(ISO) error\n");
+ retval = -EILSEQ;
+ break;
+ } else
+ ERROR(dev, "unknown error (0x%x)!\n",
+ dtd_status);
+ }
+
+ if (i != curr_req->dtd_count - 1)
+ curr_dtd = (struct langwell_dtd *)
+ curr_dtd->next_dtd_virt;
+ }
+
+ if (retval)
+ return retval;
+
+ curr_req->req.actual = actual;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* complete DATA or STATUS phase of ep0 prime status phase if needed */
+static void ep0_req_complete(struct langwell_udc *dev,
+ struct langwell_ep *ep0, struct langwell_request *req)
+{
+ u32 new_addr;
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (dev->usb_state == USB_STATE_ADDRESS) {
+ /* set the new address */
+ new_addr = (u32)dev->dev_addr;
+ writel(new_addr << USBADR_SHIFT, &dev->op_regs->deviceaddr);
+
+ new_addr = USBADR(readl(&dev->op_regs->deviceaddr));
+ VDBG(dev, "new_addr = %d\n", new_addr);
+ }
+
+ done(ep0, req, 0);
+
+ switch (dev->ep0_state) {
+ case DATA_STATE_XMIT:
+ /* receive status phase */
+ if (prime_status_phase(dev, EP_DIR_OUT))
+ ep0_stall(dev);
+ break;
+ case DATA_STATE_RECV:
+ /* send status phase */
+ if (prime_status_phase(dev, EP_DIR_IN))
+ ep0_stall(dev);
+ break;
+ case WAIT_FOR_OUT_STATUS:
+ dev->ep0_state = WAIT_FOR_SETUP;
+ break;
+ case WAIT_FOR_SETUP:
+ ERROR(dev, "unexpect ep0 packets\n");
+ break;
+ default:
+ ep0_stall(dev);
+ break;
+ }
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB transfer completion interrupt */
+static void handle_trans_complete(struct langwell_udc *dev)
+{
+ u32 complete_bits;
+ int i, ep_num, dir, bit_mask, status;
+ struct langwell_ep *epn;
+ struct langwell_request *curr_req, *temp_req;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ complete_bits = readl(&dev->op_regs->endptcomplete);
+ VDBG(dev, "endptcomplete register: 0x%08x\n", complete_bits);
+
+ /* Write-Clear the bits in endptcomplete register */
+ writel(complete_bits, &dev->op_regs->endptcomplete);
+
+ if (!complete_bits) {
+ DBG(dev, "complete_bits = 0\n");
+ goto done;
+ }
+
+ for (i = 0; i < dev->ep_max; i++) {
+ ep_num = i / 2;
+ dir = i % 2;
+
+ bit_mask = 1 << (ep_num + 16 * dir);
+
+ if (!(complete_bits & bit_mask))
+ continue;
+
+ /* ep0 */
+ if (i == 1)
+ epn = &dev->ep[0];
+ else
+ epn = &dev->ep[i];
+
+ if (epn->name == NULL) {
+ WARNING(dev, "invalid endpoint\n");
+ continue;
+ }
+
+ if (i < 2)
+ /* ep0 in and out */
+ DBG(dev, "%s-%s transfer completed\n",
+ epn->name,
+ is_in(epn) ? "in" : "out");
+ else
+ DBG(dev, "%s transfer completed\n", epn->name);
+
+ /* process the req queue until an uncomplete request */
+ list_for_each_entry_safe(curr_req, temp_req,
+ &epn->queue, queue) {
+ status = process_ep_req(dev, i, curr_req);
+ VDBG(dev, "%s req status: %d\n", epn->name, status);
+
+ if (status)
+ break;
+
+ /* write back status to req */
+ curr_req->req.status = status;
+
+ /* ep0 request completion */
+ if (ep_num == 0) {
+ ep0_req_complete(dev, epn, curr_req);
+ break;
+ } else {
+ done(epn, curr_req, status);
+ }
+ }
+ }
+done:
+ VDBG(dev, "<--- %s()\n", __func__);
+ return;
+}
+
+
+/* port change detect interrupt handler */
+static void handle_port_change(struct langwell_udc *dev)
+{
+ u32 portsc1, devlc;
+ u32 speed;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (dev->bus_reset)
+ dev->bus_reset = 0;
+
+ portsc1 = readl(&dev->op_regs->portsc1);
+ devlc = readl(&dev->op_regs->devlc);
+ VDBG(dev, "portsc1 = 0x%08x, devlc = 0x%08x\n",
+ portsc1, devlc);
+
+ /* bus reset is finished */
+ if (!(portsc1 & PORTS_PR)) {
+ /* get the speed */
+ speed = LPM_PSPD(devlc);
+ switch (speed) {
+ case LPM_SPEED_HIGH:
+ dev->gadget.speed = USB_SPEED_HIGH;
+ break;
+ case LPM_SPEED_FULL:
+ dev->gadget.speed = USB_SPEED_FULL;
+ break;
+ case LPM_SPEED_LOW:
+ dev->gadget.speed = USB_SPEED_LOW;
+ break;
+ default:
+ dev->gadget.speed = USB_SPEED_UNKNOWN;
+ break;
+ }
+ VDBG(dev, "speed = %d, dev->gadget.speed = %d\n",
+ speed, dev->gadget.speed);
+ }
+
+ /* LPM L0 to L1 */
+ if (dev->lpm && dev->lpm_state == LPM_L0)
+ if (portsc1 & PORTS_SUSP && portsc1 & PORTS_SLP) {
+ INFO(dev, "LPM L0 to L1\n");
+ dev->lpm_state = LPM_L1;
+ }
+
+ /* LPM L1 to L0, force resume or remote wakeup finished */
+ if (dev->lpm && dev->lpm_state == LPM_L1)
+ if (!(portsc1 & PORTS_SUSP)) {
+ if (portsc1 & PORTS_SLP)
+ INFO(dev, "LPM L1 to L0, force resume\n");
+ else
+ INFO(dev, "LPM L1 to L0, remote wakeup\n");
+
+ dev->lpm_state = LPM_L0;
+ }
+
+ /* update USB state */
+ if (!dev->resume_state)
+ dev->usb_state = USB_STATE_DEFAULT;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB reset interrupt handler */
+static void handle_usb_reset(struct langwell_udc *dev)
+{
+ u32 deviceaddr,
+ endptsetupstat,
+ endptcomplete;
+ unsigned long timeout;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ /* Write-Clear the device address */
+ deviceaddr = readl(&dev->op_regs->deviceaddr);
+ writel(deviceaddr & ~USBADR_MASK, &dev->op_regs->deviceaddr);
+
+ dev->dev_addr = 0;
+
+ /* clear usb state */
+ dev->resume_state = 0;
+
+ /* LPM L1 to L0, reset */
+ if (dev->lpm)
+ dev->lpm_state = LPM_L0;
+
+ dev->ep0_dir = USB_DIR_OUT;
+ dev->ep0_state = WAIT_FOR_SETUP;
+ dev->remote_wakeup = 0; /* default to 0 on reset */
+ dev->gadget.b_hnp_enable = 0;
+ dev->gadget.a_hnp_support = 0;
+ dev->gadget.a_alt_hnp_support = 0;
+
+ /* Write-Clear all the setup token semaphores */
+ endptsetupstat = readl(&dev->op_regs->endptsetupstat);
+ writel(endptsetupstat, &dev->op_regs->endptsetupstat);
+
+ /* Write-Clear all the endpoint complete status bits */
+ endptcomplete = readl(&dev->op_regs->endptcomplete);
+ writel(endptcomplete, &dev->op_regs->endptcomplete);
+
+ /* wait until all endptprime bits cleared */
+ timeout = jiffies + PRIME_TIMEOUT;
+ while (readl(&dev->op_regs->endptprime)) {
+ if (time_after(jiffies, timeout)) {
+ ERROR(dev, "USB reset timeout\n");
+ break;
+ }
+ cpu_relax();
+ }
+
+ /* write 1s to endptflush register to clear any primed buffers */
+ writel((u32) ~0, &dev->op_regs->endptflush);
+
+ if (readl(&dev->op_regs->portsc1) & PORTS_PR) {
+ VDBG(dev, "USB bus reset\n");
+ /* bus is reseting */
+ dev->bus_reset = 1;
+
+ /* reset all the queues, stop all USB activities */
+ stop_activity(dev, dev->driver);
+ dev->usb_state = USB_STATE_DEFAULT;
+ } else {
+ VDBG(dev, "device controller reset\n");
+ /* controller reset */
+ langwell_udc_reset(dev);
+
+ /* reset all the queues, stop all USB activities */
+ stop_activity(dev, dev->driver);
+
+ /* reset ep0 dQH and endptctrl */
+ ep0_reset(dev);
+
+ /* enable interrupt and set controller to run state */
+ langwell_udc_start(dev);
+
+ dev->usb_state = USB_STATE_ATTACHED;
+ }
+
+#ifdef OTG_TRANSCEIVER
+ /* refer to USB OTG 6.6.2.3 b_hnp_en is cleared */
+ if (!dev->lotg->otg.default_a)
+ dev->lotg->hsm.b_hnp_enable = 0;
+#endif
+
+ VDBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB bus suspend/resume interrupt */
+static void handle_bus_suspend(struct langwell_udc *dev)
+{
+ u32 devlc;
+ DBG(dev, "---> %s()\n", __func__);
+
+ dev->resume_state = dev->usb_state;
+ dev->usb_state = USB_STATE_SUSPENDED;
+
+#ifdef OTG_TRANSCEIVER
+ if (dev->lotg->otg.default_a) {
+ if (dev->lotg->hsm.b_bus_suspend_vld == 1) {
+ dev->lotg->hsm.b_bus_suspend = 1;
+ /* notify transceiver the state changes */
+ if (spin_trylock(&dev->lotg->wq_lock)) {
+ langwell_update_transceiver();
+ spin_unlock(&dev->lotg->wq_lock);
+ }
+ }
+ dev->lotg->hsm.b_bus_suspend_vld++;
+ } else {
+ if (!dev->lotg->hsm.a_bus_suspend) {
+ dev->lotg->hsm.a_bus_suspend = 1;
+ /* notify transceiver the state changes */
+ if (spin_trylock(&dev->lotg->wq_lock)) {
+ langwell_update_transceiver();
+ spin_unlock(&dev->lotg->wq_lock);
+ }
+ }
+ }
+#endif
+
+ /* report suspend to the driver */
+ if (dev->driver) {
+ if (dev->driver->suspend) {
+ spin_unlock(&dev->lock);
+ dev->driver->suspend(&dev->gadget);
+ spin_lock(&dev->lock);
+ DBG(dev, "suspend %s\n", dev->driver->driver.name);
+ }
+ }
+
+ /* enter PHY low power suspend */
+ devlc = readl(&dev->op_regs->devlc);
+ VDBG(dev, "devlc = 0x%08x\n", devlc);
+ devlc |= LPM_PHCD;
+ writel(devlc, &dev->op_regs->devlc);
+
+ DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+static void handle_bus_resume(struct langwell_udc *dev)
+{
+ u32 devlc;
+ DBG(dev, "---> %s()\n", __func__);
+
+ dev->usb_state = dev->resume_state;
+ dev->resume_state = 0;
+
+ /* exit PHY low power suspend */
+ devlc = readl(&dev->op_regs->devlc);
+ VDBG(dev, "devlc = 0x%08x\n", devlc);
+ devlc &= ~LPM_PHCD;
+ writel(devlc, &dev->op_regs->devlc);
+
+#ifdef OTG_TRANSCEIVER
+ if (dev->lotg->otg.default_a == 0)
+ dev->lotg->hsm.a_bus_suspend = 0;
+#endif
+
+ /* report resume to the driver */
+ if (dev->driver) {
+ if (dev->driver->resume) {
+ spin_unlock(&dev->lock);
+ dev->driver->resume(&dev->gadget);
+ spin_lock(&dev->lock);
+ DBG(dev, "resume %s\n", dev->driver->driver.name);
+ }
+ }
+
+ DBG(dev, "<--- %s()\n", __func__);
+}
+
+
+/* USB device controller interrupt handler */
+static irqreturn_t langwell_irq(int irq, void *_dev)
+{
+ struct langwell_udc *dev = _dev;
+ u32 usbsts,
+ usbintr,
+ irq_sts,
+ portsc1;
+
+ VDBG(dev, "---> %s()\n", __func__);
+
+ if (dev->stopped) {
+ VDBG(dev, "handle IRQ_NONE\n");
+ VDBG(dev, "<--- %s()\n", __func__);
+ return IRQ_NONE;
+ }
+
+ spin_lock(&dev->lock);
+
+ /* USB status */
+ usbsts = readl(&dev->op_regs->usbsts);
+
+ /* USB interrupt enable */
+ usbintr = readl(&dev->op_regs->usbintr);
+
+ irq_sts = usbsts & usbintr;
+ VDBG(dev, "usbsts = 0x%08x, usbintr = 0x%08x, irq_sts = 0x%08x\n",
+ usbsts, usbintr, irq_sts);
+
+ if (!irq_sts) {
+ VDBG(dev, "handle IRQ_NONE\n");
+ VDBG(dev, "<--- %s()\n", __func__);
+ spin_unlock(&dev->lock);
+ return IRQ_NONE;
+ }
+
+ /* Write-Clear interrupt status bits */
+ writel(irq_sts, &dev->op_regs->usbsts);
+
+ /* resume from suspend */
+ portsc1 = readl(&dev->op_regs->portsc1);
+ if (dev->usb_state == USB_STATE_SUSPENDED)
+ if (!(portsc1 & PORTS_SUSP))
+ handle_bus_resume(dev);
+
+ /* USB interrupt */
+ if (irq_sts & STS_UI) {
+ VDBG(dev, "USB interrupt\n");
+
+ /* setup packet received from ep0 */
+ if (readl(&dev->op_regs->endptsetupstat)
+ & EP0SETUPSTAT_MASK) {
+ VDBG(dev, "USB SETUP packet received interrupt\n");
+ /* setup tripwire semaphone */
+ setup_tripwire(dev);
+ handle_setup_packet(dev, &dev->local_setup_buff);
+ }
+
+ /* USB transfer completion */
+ if (readl(&dev->op_regs->endptcomplete)) {
+ VDBG(dev, "USB transfer completion interrupt\n");
+ handle_trans_complete(dev);
+ }
+ }
+
+ /* SOF received interrupt (for ISO transfer) */
+ if (irq_sts & STS_SRI) {
+ /* FIXME */
+ /* VDBG(dev, "SOF received interrupt\n"); */
+ }
+
+ /* port change detect interrupt */
+ if (irq_sts & STS_PCI) {
+ VDBG(dev, "port change detect interrupt\n");
+ handle_port_change(dev);
+ }
+
+ /* suspend interrrupt */
+ if (irq_sts & STS_SLI) {
+ VDBG(dev, "suspend interrupt\n");
+ handle_bus_suspend(dev);
+ }
+
+ /* USB reset interrupt */
+ if (irq_sts & STS_URI) {
+ VDBG(dev, "USB reset interrupt\n");
+ handle_usb_reset(dev);
+ }
+
+ /* USB error or system error interrupt */
+ if (irq_sts & (STS_UEI | STS_SEI)) {
+ /* FIXME */
+ WARNING(dev, "error IRQ, irq_sts: %x\n", irq_sts);
+ }
+
+ spin_unlock(&dev->lock);
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return IRQ_HANDLED;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* release device structure */
+static void gadget_release(struct device *_dev)
+{
+ struct langwell_udc *dev = the_controller;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ complete(dev->done);
+
+ DBG(dev, "<--- %s()\n", __func__);
+ kfree(dev);
+}
+
+
+/* tear down the binding between this driver and the pci device */
+static void langwell_udc_remove(struct pci_dev *pdev)
+{
+ struct langwell_udc *dev = the_controller;
+
+ DECLARE_COMPLETION(done);
+
+ BUG_ON(dev->driver);
+ DBG(dev, "---> %s()\n", __func__);
+
+ dev->done = &done;
+
+ /* free memory allocated in probe */
+ if (dev->dtd_pool)
+ dma_pool_destroy(dev->dtd_pool);
+
+ if (dev->status_req) {
+ kfree(dev->status_req->req.buf);
+ kfree(dev->status_req);
+ }
+
+ if (dev->ep_dqh)
+ dma_free_coherent(&pdev->dev, dev->ep_dqh_size,
+ dev->ep_dqh, dev->ep_dqh_dma);
+
+ kfree(dev->ep);
+
+ /* diable IRQ handler */
+ if (dev->got_irq)
+ free_irq(pdev->irq, dev);
+
+#ifndef OTG_TRANSCEIVER
+ if (dev->cap_regs)
+ iounmap(dev->cap_regs);
+
+ if (dev->region)
+ release_mem_region(pci_resource_start(pdev, 0),
+ pci_resource_len(pdev, 0));
+
+ if (dev->enabled)
+ pci_disable_device(pdev);
+#else
+ if (dev->transceiver) {
+ otg_put_transceiver(dev->transceiver);
+ dev->transceiver = NULL;
+ dev->lotg = NULL;
+ }
+#endif
+
+ dev->cap_regs = NULL;
+
+ INFO(dev, "unbind\n");
+ DBG(dev, "<--- %s()\n", __func__);
+
+ device_unregister(&dev->gadget.dev);
+ device_remove_file(&pdev->dev, &dev_attr_langwell_udc);
+
+#ifndef OTG_TRANSCEIVER
+ pci_set_drvdata(pdev, NULL);
+#endif
+
+ /* free dev, wait for the release() finished */
+ wait_for_completion(&done);
+
+ the_controller = NULL;
+}
+
+
+/*
+ * wrap this driver around the specified device, but
+ * don't respond over USB until a gadget driver binds to us.
+ */
+static int langwell_udc_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct langwell_udc *dev;
+#ifndef OTG_TRANSCEIVER
+ unsigned long resource, len;
+#endif
+ void __iomem *base = NULL;
+ size_t size;
+ int retval;
+
+ if (the_controller) {
+ dev_warn(&pdev->dev, "ignoring\n");
+ return -EBUSY;
+ }
+
+ /* alloc, and start init */
+ dev = kzalloc(sizeof *dev, GFP_KERNEL);
+ if (dev == NULL) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ /* initialize device spinlock */
+ spin_lock_init(&dev->lock);
+
+ dev->pdev = pdev;
+ DBG(dev, "---> %s()\n", __func__);
+
+#ifdef OTG_TRANSCEIVER
+ /* PCI device is already enabled by otg_transceiver driver */
+ dev->enabled = 1;
+
+ /* mem region and register base */
+ dev->region = 1;
+ dev->transceiver = otg_get_transceiver();
+ dev->lotg = otg_to_langwell(dev->transceiver);
+ base = dev->lotg->regs;
+#else
+ pci_set_drvdata(pdev, dev);
+
+ /* now all the pci goodies ... */
+ if (pci_enable_device(pdev) < 0) {
+ retval = -ENODEV;
+ goto error;
+ }
+ dev->enabled = 1;
+
+ /* control register: BAR 0 */
+ resource = pci_resource_start(pdev, 0);
+ len = pci_resource_len(pdev, 0);
+ if (!request_mem_region(resource, len, driver_name)) {
+ ERROR(dev, "controller already in use\n");
+ retval = -EBUSY;
+ goto error;
+ }
+ dev->region = 1;
+
+ base = ioremap_nocache(resource, len);
+#endif
+ if (base == NULL) {
+ ERROR(dev, "can't map memory\n");
+ retval = -EFAULT;
+ goto error;
+ }
+
+ dev->cap_regs = (struct langwell_cap_regs __iomem *) base;
+ VDBG(dev, "dev->cap_regs: %p\n", dev->cap_regs);
+ dev->op_regs = (struct langwell_op_regs __iomem *)
+ (base + OP_REG_OFFSET);
+ VDBG(dev, "dev->op_regs: %p\n", dev->op_regs);
+
+ /* irq setup after old hardware is cleaned up */
+ if (!pdev->irq) {
+ ERROR(dev, "No IRQ. Check PCI setup!\n");
+ retval = -ENODEV;
+ goto error;
+ }
+
+#ifndef OTG_TRANSCEIVER
+ INFO(dev, "irq %d, io mem: 0x%08lx, len: 0x%08lx, pci mem 0x%p\n",
+ pdev->irq, resource, len, base);
+ /* enables bus-mastering for device dev */
+ pci_set_master(pdev);
+
+ if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED,
+ driver_name, dev) != 0) {
+ ERROR(dev, "request interrupt %d failed\n", pdev->irq);
+ retval = -EBUSY;
+ goto error;
+ }
+ dev->got_irq = 1;
+#endif
+
+ /* set stopped bit */
+ dev->stopped = 1;
+
+ /* capabilities and endpoint number */
+ dev->lpm = (readl(&dev->cap_regs->hccparams) & HCC_LEN) ? 1 : 0;
+ dev->dciversion = readw(&dev->cap_regs->dciversion);
+ dev->devcap = (readl(&dev->cap_regs->dccparams) & DEVCAP) ? 1 : 0;
+ VDBG(dev, "dev->lpm: %d\n", dev->lpm);
+ VDBG(dev, "dev->dciversion: 0x%04x\n", dev->dciversion);
+ VDBG(dev, "dccparams: 0x%08x\n", readl(&dev->cap_regs->dccparams));
+ VDBG(dev, "dev->devcap: %d\n", dev->devcap);
+ if (!dev->devcap) {
+ ERROR(dev, "can't support device mode\n");
+ retval = -ENODEV;
+ goto error;
+ }
+
+ /* a pair of endpoints (out/in) for each address */
+ dev->ep_max = DEN(readl(&dev->cap_regs->dccparams)) * 2;
+ VDBG(dev, "dev->ep_max: %d\n", dev->ep_max);
+
+ /* allocate endpoints memory */
+ dev->ep = kzalloc(sizeof(struct langwell_ep) * dev->ep_max,
+ GFP_KERNEL);
+ if (!dev->ep) {
+ ERROR(dev, "allocate endpoints memory failed\n");
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ /* allocate device dQH memory */
+ size = dev->ep_max * sizeof(struct langwell_dqh);
+ VDBG(dev, "orig size = %d\n", size);
+ if (size < DQH_ALIGNMENT)
+ size = DQH_ALIGNMENT;
+ else if ((size % DQH_ALIGNMENT) != 0) {
+ size += DQH_ALIGNMENT + 1;
+ size &= ~(DQH_ALIGNMENT - 1);
+ }
+ dev->ep_dqh = dma_alloc_coherent(&pdev->dev, size,
+ &dev->ep_dqh_dma, GFP_KERNEL);
+ if (!dev->ep_dqh) {
+ ERROR(dev, "allocate dQH memory failed\n");
+ retval = -ENOMEM;
+ goto error;
+ }
+ dev->ep_dqh_size = size;
+ VDBG(dev, "ep_dqh_size = %d\n", dev->ep_dqh_size);
+
+ /* initialize ep0 status request structure */
+ dev->status_req = kzalloc(sizeof(struct langwell_request), GFP_KERNEL);
+ if (!dev->status_req) {
+ ERROR(dev, "allocate status_req memory failed\n");
+ retval = -ENOMEM;
+ goto error;
+ }
+ INIT_LIST_HEAD(&dev->status_req->queue);
+
+ /* allocate a small amount of memory to get valid address */
+ dev->status_req->req.buf = kmalloc(8, GFP_KERNEL);
+ dev->status_req->req.dma = virt_to_phys(dev->status_req->req.buf);
+
+ dev->resume_state = USB_STATE_NOTATTACHED;
+ dev->usb_state = USB_STATE_POWERED;
+ dev->ep0_dir = USB_DIR_OUT;
+ dev->remote_wakeup = 0; /* default to 0 on reset */
+
+#ifndef OTG_TRANSCEIVER
+ /* reset device controller */
+ langwell_udc_reset(dev);
+#endif
+
+ /* initialize gadget structure */
+ dev->gadget.ops = &langwell_ops; /* usb_gadget_ops */
+ dev->gadget.ep0 = &dev->ep[0].ep; /* gadget ep0 */
+ INIT_LIST_HEAD(&dev->gadget.ep_list); /* ep_list */
+ dev->gadget.speed = USB_SPEED_UNKNOWN; /* speed */
+ dev->gadget.is_dualspeed = 1; /* support dual speed */
+#ifdef OTG_TRANSCEIVER
+ dev->gadget.is_otg = 1; /* support otg mode */
+#endif
+
+ /* the "gadget" abstracts/virtualizes the controller */
+ dev_set_name(&dev->gadget.dev, "gadget");
+ dev->gadget.dev.parent = &pdev->dev;
+ dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
+ dev->gadget.dev.release = gadget_release;
+ dev->gadget.name = driver_name; /* gadget name */
+
+ /* controller endpoints reinit */
+ eps_reinit(dev);
+
+#ifndef OTG_TRANSCEIVER
+ /* reset ep0 dQH and endptctrl */
+ ep0_reset(dev);
+#endif
+
+ /* create dTD dma_pool resource */
+ dev->dtd_pool = dma_pool_create("langwell_dtd",
+ &dev->pdev->dev,
+ sizeof(struct langwell_dtd),
+ DTD_ALIGNMENT,
+ DMA_BOUNDARY);
+
+ if (!dev->dtd_pool) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
+ /* done */
+ INFO(dev, "%s\n", driver_desc);
+ INFO(dev, "irq %d, pci mem %p\n", pdev->irq, base);
+ INFO(dev, "Driver version: " DRIVER_VERSION "\n");
+ INFO(dev, "Support (max) %d endpoints\n", dev->ep_max);
+ INFO(dev, "Device interface version: 0x%04x\n", dev->dciversion);
+ INFO(dev, "Controller mode: %s\n", dev->devcap ? "Device" : "Host");
+ INFO(dev, "Support USB LPM: %s\n", dev->lpm ? "Yes" : "No");
+
+ VDBG(dev, "After langwell_udc_probe(), print all registers:\n");
+#ifdef VERBOSE
+ print_all_registers(dev);
+#endif
+
+ the_controller = dev;
+
+ retval = device_register(&dev->gadget.dev);
+ if (retval)
+ goto error;
+
+ retval = device_create_file(&pdev->dev, &dev_attr_langwell_udc);
+ if (retval)
+ goto error;
+
+ VDBG(dev, "<--- %s()\n", __func__);
+ return 0;
+
+error:
+ if (dev) {
+ DBG(dev, "<--- %s()\n", __func__);
+ langwell_udc_remove(pdev);
+ }
+
+ return retval;
+}
+
+
+/* device controller suspend */
+static int langwell_udc_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct langwell_udc *dev = the_controller;
+ u32 devlc;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ /* disable interrupt and set controller to stop state */
+ langwell_udc_stop(dev);
+
+ /* diable IRQ handler */
+ if (dev->got_irq)
+ free_irq(pdev->irq, dev);
+ dev->got_irq = 0;
+
+
+ /* save PCI state */
+ pci_save_state(pdev);
+
+ /* set device power state */
+ pci_set_power_state(pdev, PCI_D3hot);
+
+ /* enter PHY low power suspend */
+ devlc = readl(&dev->op_regs->devlc);
+ VDBG(dev, "devlc = 0x%08x\n", devlc);
+ devlc |= LPM_PHCD;
+ writel(devlc, &dev->op_regs->devlc);
+
+ DBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* device controller resume */
+static int langwell_udc_resume(struct pci_dev *pdev)
+{
+ struct langwell_udc *dev = the_controller;
+ u32 devlc;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ /* exit PHY low power suspend */
+ devlc = readl(&dev->op_regs->devlc);
+ VDBG(dev, "devlc = 0x%08x\n", devlc);
+ devlc &= ~LPM_PHCD;
+ writel(devlc, &dev->op_regs->devlc);
+
+ /* set device D0 power state */
+ pci_set_power_state(pdev, PCI_D0);
+
+ /* restore PCI state */
+ pci_restore_state(pdev);
+
+ /* enable IRQ handler */
+ if (request_irq(pdev->irq, langwell_irq, IRQF_SHARED, driver_name, dev)
+ != 0) {
+ ERROR(dev, "request interrupt %d failed\n", pdev->irq);
+ return -1;
+ }
+ dev->got_irq = 1;
+
+ /* reset and start controller to run state */
+ if (dev->stopped) {
+ /* reset device controller */
+ langwell_udc_reset(dev);
+
+ /* reset ep0 dQH and endptctrl */
+ ep0_reset(dev);
+
+ /* start device if gadget is loaded */
+ if (dev->driver)
+ langwell_udc_start(dev);
+ }
+
+ /* reset USB status */
+ dev->usb_state = USB_STATE_ATTACHED;
+ dev->ep0_state = WAIT_FOR_SETUP;
+ dev->ep0_dir = USB_DIR_OUT;
+
+ DBG(dev, "<--- %s()\n", __func__);
+ return 0;
+}
+
+
+/* pci driver shutdown */
+static void langwell_udc_shutdown(struct pci_dev *pdev)
+{
+ struct langwell_udc *dev = the_controller;
+ u32 usbmode;
+
+ DBG(dev, "---> %s()\n", __func__);
+
+ /* reset controller mode to IDLE */
+ usbmode = readl(&dev->op_regs->usbmode);
+ DBG(dev, "usbmode = 0x%08x\n", usbmode);
+ usbmode &= (~3 | MODE_IDLE);
+ writel(usbmode, &dev->op_regs->usbmode);
+
+ DBG(dev, "<--- %s()\n", __func__);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static const struct pci_device_id pci_ids[] = { {
+ .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
+ .class_mask = ~0,
+ .vendor = 0x8086,
+ .device = 0x0811,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+}, { /* end: all zeroes */ }
+};
+
+
+MODULE_DEVICE_TABLE(pci, pci_ids);
+
+
+static struct pci_driver langwell_pci_driver = {
+ .name = (char *) driver_name,
+ .id_table = pci_ids,
+
+ .probe = langwell_udc_probe,
+ .remove = langwell_udc_remove,
+
+ /* device controller suspend/resume */
+ .suspend = langwell_udc_suspend,
+ .resume = langwell_udc_resume,
+
+ .shutdown = langwell_udc_shutdown,
+};
+
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Xiaochen Shen <xiaochen.shen@intel.com>");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+
+
+static int __init init(void)
+{
+#ifdef OTG_TRANSCEIVER
+ return langwell_register_peripheral(&langwell_pci_driver);
+#else
+ return pci_register_driver(&langwell_pci_driver);
+#endif
+}
+module_init(init);
+
+
+static void __exit cleanup(void)
+{
+#ifdef OTG_TRANSCEIVER
+ return langwell_unregister_peripheral(&langwell_pci_driver);
+#else
+ pci_unregister_driver(&langwell_pci_driver);
+#endif
+}
+module_exit(cleanup);
+
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff